SimpleFontDataPango.cpp [plain text]
#include "config.h"
#include "SimpleFontData.h"
#include "FloatRect.h"
#include "Font.h"
#include "FontCache.h"
#include "FontDescription.h"
#include "GlyphBuffer.h"
#include <cairo.h>
#include <wtf/MathExtras.h>
namespace WebCore {
void SimpleFontData::platformInit()
{
cairo_font_extents_t font_extents;
cairo_text_extents_t text_extents;
cairo_scaled_font_extents(m_font.m_scaledFont, &font_extents);
m_ascent = static_cast<int>(font_extents.ascent);
m_descent = static_cast<int>(font_extents.descent);
m_lineSpacing = static_cast<int>(font_extents.height);
cairo_scaled_font_text_extents(m_font.m_scaledFont, "x", &text_extents);
m_xHeight = text_extents.height;
cairo_scaled_font_text_extents(m_font.m_scaledFont, " ", &text_extents);
m_spaceWidth = static_cast<int>(text_extents.x_advance);
m_lineGap = m_lineSpacing - m_ascent - m_descent;
}
void SimpleFontData::platformDestroy()
{
if (!isCustomFont()) {
if (m_font.m_font && m_font.m_font != reinterpret_cast<PangoFont*>(-1)) {
g_object_unref(m_font.m_font);
m_font.m_font = 0;
}
if (m_font.m_context) {
g_object_unref (m_font.m_context);
m_font.m_context = 0;
}
if (m_font.m_scaledFont) {
cairo_scaled_font_destroy(m_font.m_scaledFont);
m_font.m_scaledFont = 0;
}
}
delete m_smallCapsFontData;
m_smallCapsFontData = 0;
}
SimpleFontData* SimpleFontData::smallCapsFontData(const FontDescription& fontDescription) const
{
if (!m_smallCapsFontData) {
FontDescription desc = FontDescription(fontDescription);
desc.setSpecifiedSize(0.70f*fontDescription.computedSize());
const FontPlatformData* pdata = new FontPlatformData(desc, desc.family().family());
m_smallCapsFontData = new SimpleFontData(*pdata);
}
return m_smallCapsFontData;
}
bool SimpleFontData::containsCharacters(const UChar* characters, int length) const
{
bool result = true;
PangoCoverage* coverage = pango_font_get_coverage(m_font.m_font, pango_language_get_default());
for (int i = 0; i < length; i++) {
if (PANGO_COVERAGE_NONE == pango_coverage_get(coverage, characters[i])) {
result = false;
break;
}
}
pango_coverage_unref(coverage);
return result;
}
void SimpleFontData::determinePitch()
{
if (isCustomFont()) {
m_treatAsFixedPitch = false;
return;
}
m_treatAsFixedPitch = m_font.isFixedPitch();
}
float SimpleFontData::platformWidthForGlyph(Glyph glyph) const
{
ASSERT(m_font.m_scaledFont);
cairo_glyph_t cglyph = { glyph, 0, 0 };
cairo_text_extents_t extents;
cairo_scaled_font_glyph_extents(m_font.m_scaledFont, &cglyph, 1, &extents);
float w = (float)m_spaceWidth;
if (cairo_scaled_font_status(m_font.m_scaledFont) == CAIRO_STATUS_SUCCESS && extents.x_advance != 0)
w = (float)extents.x_advance;
return w;
}
void SimpleFontData::setFont(cairo_t* cr) const
{
ASSERT(cr);
m_font.setFont(cr);
}
}